JP3176332B2 - Anchored body used for foundation anchoring method of foundation pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile anchor used in a method for anchoring a pile head of a foundation pile.

[0002]

2. Description of the Related Art As a construction method of a foundation portion of a structure, a structure supported by a foundation pile is generally employed. As a construction method fixed to the foundation of the foundation pile, the pile head is used as shown in FIG. 1a is exposed by about 10 cm from the base line L2, and the lower half of the braided reinforcing bar E composed of the vertical bar e1 and the band bar e2 is inserted into the hollow portion 2 of the pile head 1a, and this is filled with the concrete C2.
And fixed to the pile head 1a with the exposed portion of the pile head 1a and the reinforcing bar E
A method of fixing the upper half of the base 10 to the foundation 10 (hereinafter referred to as an A-type method) and a method of setting the foundation 10 so that the pile head 1a can be exposed from the base line L2 to an outer diameter of the foundation pile as shown in FIG. There is known a method of deepening the concrete thickness and fixing the pile head 1a to the foundation 10 (hereinafter, referred to as a B-type method).

[0003]

In recent years, the seismic resistance of the building has been particularly required, and the conventional A-type construction method has a problem that the pile head fixing degree is small and the seismic resistance is weak. In addition, the B-type method requires deep digging of the root cutting surface and thickening of the foundation, which increases the amount of soil retaining work, increases the amount of remaining soil treatment and backfilling, and increases the amount of rainwater when rain continues. In addition to the water refilling work, the pile head projecting more than the bottom of the root cuts, and the workability of compacting the foundation, crushed concrete, formwork, reinforcing bars, etc. also deteriorates. In addition, there is a large problem that a large amount of time and labor is required, such as an increase in the amount of concrete used and the amount of reinforcing bars used for the foundation, and the construction cost is increased.

As means for solving the problems of the conventional A-type method and B-type method, the applicant has previously filed Japanese Patent Application No. Hei 6-264480.
No. (JP-A-8-105066) was invented (hereinafter referred to as the prior invention). In the prior invention, as shown in FIG. 8, a root cutting recess 4 is dug down around the outer periphery of the pile head 1a of the foundation pile 1 penetrating into the ground B, and a soil fastener G is inserted into the root cutting recess 4, and the root cutting is performed. After retaining the concave portion 4, the lower half of the reinforcing bar E is inserted into the space A formed between the earth retaining member G and the pile head 1a, and concrete is poured into the space A when the foundation 10 is cast. Casting, forming the same RC structure as the foundation pile 1 around the pile head 1a. It is superior in seismic resistance to the A-type method and can reduce the amount of root excavation of the foundation compared to the B-type method. have.

[0005]

Therefore, the present invention has been studied for the invention of the prior application, and has a smaller root cutting amount and superior seismic resistance than the invention of the earlier application, simplifies the construction, shortens the construction period, and It is an object of the present invention to provide a pile anchor used for a foundation anchoring method of a foundation pile which can reduce costs.

[0006]

SUMMARY OF THE INVENTION The present invention provides, as a pile anchoring body used in the foundation anchoring method for a foundation pile of the above object, a reinforcing ring inserted between a root cutting recess and a pile head, and a reinforcing ring. It is characterized by comprising a reinforcing bar projecting upward and fixed in the foundation, and a space holding portion formed by bending a lower end portion of the reinforcing bar for maintaining a space between the reinforcing ring and the pile head.

Here, the foundation is a general term for a lower structure that transmits the load from the upper structure to the ground, and includes an independent foundation, a cloth foundation, a composite foundation, a solid foundation, and a foundation slab provided between the solid foundations. Say. Here, a foundation pile is a pile that transmits the weight of a structure from the foundation to the ground.
The material etc. are free, but if you consider seismic resistance etc., PHC
It is desirable to use piles (prestressed concrete piles) and PRC piles (prestressed reinforced concrete piles).

When formed in this manner, the reinforcing ring serves both as a soil retaining for the root cutting recess and a concrete form poured into the foundation when the foundation is laid, and is formed around the outer periphery of the pile head by solidification of the concrete. A steel pipe filled with concrete is shown), and reinforcement is buried in the foundation, forming a part of the foundation of the RC structure (reinforced concrete structure is shown).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a method of anchoring a foundation pile is shown in FIG.
And FIG. Foundation pile 1 penetrated into ground B
A root cutting recess 4 is dug down around the outer periphery of the pile head 1a, and a pile anchoring body 5 is inserted into the root cutting recess 4 so that the pile head 1
The hollow portion 2a is closed with a closing body 3, and concrete is poured into a space a formed between the pile head 1a and the pile anchoring body 5 when the foundation 10 is poured into the concrete and solidified. The body 5 also serves as a retaining wall for the root cutting recess 4 and a formwork for pouring concrete, forms an SC structure portion 11 around the outer periphery of the pile head 1a together with the solidified concrete, and the upper portion of the pile anchoring body 5 It is buried in the foundation 10 and the foundation 1 of the RC structure
It becomes a part of 0.

[0010] The root cutting recess 4 is formed by digging down the split stone floor line L1 around the pile head 1a further deeply after the groundwork of the split stone floor line L1 to form a substantially donut-shaped root cut around the outer periphery of the pile head 1a. The concave portion 4 or the inverted truncated cone-shaped root concave portion 4 having a wide mouth upward from the bottom surface is formed. After the pile anchoring body 5 is inserted, the split stone D is placed on the split stone floor L1. D. Concrete C1 is placed on D, and the pile anchoring body 5 is compacted, and a baseline L2 is formed with the discarded concrete C1. The root cutting width h of the root cutting recess 4 is such that the pile anchoring body 5 forms the space part a with the pile head 1a and the SC structure part 11 is formed by concrete poured into the space part a.
It is about 1/2 of the root cutting width H in the prior invention, for example, about the arrangement position of the vertical bar e1 of the braided reinforcing bar E.

The lower part of the pile anchoring body 5 is inserted into the root cutting recess 4, the inner periphery of the root cutting recess 4 is earthed, and the pile head 1a is fixed.
A space a is formed between the SC structure 11 and the formwork of the SC structure 11 when the foundation 10 is cast. The concrete poured into the space a is solidified to form the SC structure 11 together with the concrete.
Is formed and the upper half is buried in the foundation 10 to form a part of the foundation 10 of the RC structure. Closure body 3 for closing hollow part 2 of foundation pile 1
Can be installed in any order as long as the foundation 10 is not yet placed.

Next, the structure of the pile fixing body of the present invention used in the foundation fixing method of the foundation pile will be described with reference to FIGS. 3 and 4 of the embodiment. The pile anchoring body 5 includes a reinforcing ring 6 inserted between the pile head 1a and the root cutting recess 4, a reinforcing bar 7 projecting upward from the reinforcing ring 6 and fixed in the foundation 10, a reinforcing ring 6 and the pile head. And an interval holding section 8 for maintaining an interval between the sections 1a. The reinforcing ring 6 is formed by cutting a long steel pipe having a diameter slightly smaller than the inner circumference of the root cutting recess 4 or welding a steel plate into a cylindrical shape or a substantially cylindrical shape having a diameter slightly smaller than the inner circumference of the root cutting recess 4. , Root cutting recess 4
To form a space a between the pile head 1a and a mold for pouring concrete. The SC structure 11 is formed by solidifying the concrete. The reinforcement half 7 is fixed to the inner peripheral surface of the reinforcement ring 6 at appropriate intervals, and the upper half protrudes upward from the reinforcement ring 6 to form a part of the foundation 10 of the RC structure. The space holding portions 8 are provided at appropriate intervals on the inner peripheral surface of the reinforcing ring 6, and need to be provided so as not to prevent the concrete from flowing into the space a.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS If the inner peripheral surface of the reinforcing ring 6 is roughened, the adhesion to concrete is improved, and the integration of the SC structure 11 is enhanced. It is also possible to use a round bar as the reinforcing bar 7, but it is preferable to use a different-diameter bar having good adhesion to concrete, and it is also possible to use an adhesive as a fixing means to the reinforcing ring 6. However, adhesion by welding is preferable. The space holding portion 8 is formed by the reinforcing ring 6 and the pile head 1a.
Any shape or structure can be used as long as it protrudes toward the target, but the lower end of the reinforcing bar 7 is bent, and the bent portion is not formed as the space holding portion 8, or the space holding portion 8 is formed separately. It is also possible to weld to the reinforcing ring 6.

The closing member 3 has a disk shape substantially the same as the inner diameter of the hollow portion 2 and is closed by hanging it from above the pile head 1a with a hanging tool such as a wire, or the balloon-like closing member 3 is closed. In order to close the hollow part 2 by inflating it in the space 2 or covering it like a lid on the pile head 1a as shown in FIG. Concrete C2 is filled. The closing body 3 does not need to completely cover the hollow portion 2, and may be of such a degree that concrete does not flow into the hollow portion 2.

[0015]

As described above, the pile anchor of the present invention has the following effects. If the pile anchoring body of the present invention is used for the foundation anchoring method, the reinforcing ring first secures the root cutting recess, forms a space between the pile head and the pile head, and forms a formwork when the foundation is cast. Next, together with the solidified concrete, an SC structure is formed on the outer periphery of the pile head to strengthen the anchorage between the foundation pile and the foundation. Reinforcing bars are buried in the foundation.
It forms part of the basis of the C structure. In addition, since pile anchors can be mass-produced in factories, there is an advantage that they can be provided at low cost.

[Brief description of the drawings]

1 (A), 1 (B), and 1 (C) are process diagrams showing a foundation fixing method for a foundation pile.

FIGS. 2A, 2B, and 2C are partially cutaway plan views.

FIG. 3 is a longitudinal sectional view showing a structural example of a pile anchor according to the present invention.

FIG. 4 is a vertical cross-sectional view of a pile fixing member showing an example of forming a spacing member.

5 (A) and 5 (B) are views showing a use state of a pile anchoring body.

FIG. 6 is a cross-sectional view showing a conventional A-type method.

FIG. 7 is a cross-sectional view showing a conventional B-type method.

8 (A) and 8 (B) are cross-sectional views showing the prior invention invention method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation pile, 1a pile head 2 Hollow part 3 Closure body 4 Root cutting recess 5 Pile anchoring body 6 Reinforcement ring 7 Reinforcing bar 8 Spacing part 10 Foundation, 11 SC structure part B Ground C1 Discarded concrete, C2 Filling concrete D Split Stone E Braided Reinforcing Bar, F Base Bar G Earth Fixture A Space from Pile Head to Soil Fixture a Space from Pile Head to Pile Anchorage H, h Root width L1 Split Stone Stone Line, L2 Base line

Claims (1)

(57) [Claims] 1. A reinforcing ring (6) fitted between a root cutting recess (4) and a pile head (1a), and protruding upward from the reinforcing ring (6) to be fixed in a foundation (10). A reinforcing bar (7) and a spacing unit (8) formed by bending a lower end of the reinforcing bar (7) to maintain a space between the reinforcing ring (6) and the pile head (1a) are provided. A pile anchoring body used in a foundation anchoring method for a foundation pile.